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The phrase "at least threefold" is correct and usable in written English.
It can be used to indicate that something is at a minimum three times greater or more than a certain amount or value.
Example: "The company's profits increased at least threefold over the past year, demonstrating significant growth."
Alternatives: "a minimum of three times" or "no less than three times".
Exact(60)
Unfazed by this discrepancy and confident of an "at least threefold return" on his investment, Srivastava has recently announced plans to auction the works as early as this summer.
The problem is at least threefold, analysts said.
Because Inform gives readers an easy way to find related stories that were published earlier on NewsOK.com, Ms. Fry said she expected the number of page views on the site to increase by at least threefold.
They are at least threefold more potent [26].
The number of biological and analytical replications in the experiment is at least threefold.
The gain in computational efficiency was at least threefold and this gain increased with the increase of time step.
Cells were considered to have positive growth characteristics if their OD value had doubled at least threefold.
They identified 122 bacterial genes that increased their activity by at least threefold by the pressure change.
Importantly, the number of samples per organ/mouse was increased at least threefold and a significant time reduction per analysis was realized.
In addition, our biodistribution data showed little decrease in tumor activity accumulation up to 96 h, while the circulating antibody concentration decreased at least threefold.
One of the variants increased the risk at least threefold, and the other two boosted it more than 10-fold, the teams reported.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com